| Landslide is a frequent geological disaster with extremely serious harm,which not only threatens human life safety,but also damages property,environment and resources.As the landslide group on the Likan Highway poses a threat to the lives and property safety of the people nearby,it is urgent to find out its current characteristics and give its stability analysis.In this paper,the Likan highway landslide group of Lijiaxia power station is taken as the research object,and through field geological survey,geological mapping,drilling,laboratory tests and other technical means,the geological environment conditions and basic characteristics of the landslide group are elaborated in detail.According to the deformation characteristics of the landslide,the formation conditions of the landslide are systematically analyzed.The stability of landslide groups is analyzed qualitatively and quantitatively.The specific research results are as follows:(1)The landslide group is high in the south west and low in the north east.It is a loess landslide on a mixed rock-soil slope,covered with aeolian loess and underlying bedrock;The occurrence combination of the potential sliding surface and the upper loess natural slope is a forward slope,which is not conducive to the stability of the loess slope.The front shear outlet is open to the air and has unfavorable topographic and geomorphological conditions for gravity to slide down to the Yellow River valley.(2)The landslide group consists of 1# and 2# landslide bodies.The 1# landslide and 2# landslide belong to traction landslide and slide backward in stages.The main deformation and failure mode is that the loess body slides along the underlying mudstone surface and is currently in creep deformation stage.Topographic conditions and stratum structure are the foundation of landslide.The foot excavation of Likan highway and drainage channel is the direct inducing factor leading to instability of landslide front edge.Rainfall and artificial irrigation are also the important inducing factors to accelerate the upward development of slope deformation.(3)The limit equilibrium method is used to calculate and analyze the stability of landslide under natural,rainstorm and earthquake conditions.The calculation results show that the Likan landslide group is unstable to unstable under natural conditions.Under rainstorm condition,it is in unstable ~ unstable state.It is unstable under earthquake conditions.(4)FLAC3D is used to simulate the stability of the landslide under natural conditions.The results show that the sliding mode of the landslide is not an overall sliding with consistent deformation before and after,but a gradual sliding from steep to slow and from surface to inside in the creep deformation process,which is consistent with the deformation state of the landslide site and the geological judgment results.??This research work on the Li-Kan highway landslide group provides certain basic data for the prevention and control measures of the Li-Kan highway landslide group.The research methods and results in this paper are not only of practical and guiding significance to Lijiaxia project,but also of certain reference value to other slope projects. |
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